Cisco WS-CBS3032-DEL Software Configuration Manual page 1188

Configuring Optional Multicast Routing Features
Figure 45-7
You can define an administratively-scoped boundary on a routed interface for multicast group addresses.
A standard access list defines the range of addresses affected. When a boundary is defined, no multicast
data packets are allowed to flow across the boundary from either direction. The boundary allows the
same multicast group address to be reused in different administrative domains.
The IANA has designated the multicast address range 239.0.0.0 to 239.255.255.255 as the
administratively-scoped addresses. This range of addresses can then be reused in domains administered
by different organizations. The addresses would be considered local, not globally unique.
Beginning in privileged EXEC mode, follow these steps to set up an administratively-scoped boundary.
This procedure is optional.
Command
Step 1
configure terminal
Step 2
access-list access-list-number {deny |
permit} source [source-wildcard]
Step 3 interface interface-id
Step 4 ip multicast boundary
access-list-number
Step 5 end
Step 6
show running-config
Step 7 copy running-config startup-config
Cisco Catalyst Blade Switch 3130 and 3032 for Dell Software Configuration Guide
45-52
Administratively-Scoped Boundaries
Company XYZ
Engineering Marketing
239.128.0.0/16
239.0.0.0/8
Purpose
Enter global configuration mode.
Create a standard access list, repeating the command as many times as
necessary.
• For access-list-number, the range is 1 to 99.
The deny keyword denies access if the conditions are matched. The
•
permit keyword permits access if the conditions are matched.
• For source, enter the number of the network or host from which the
packet is being sent.
• (Optional) For source-wildcard, enter the wildcard bits in dotted
decimal notation to be applied to the source. Place ones in the bit
positions that you want to ignore.
Recall that the access list is always terminated by an implicit deny
statement for everything.
Specify the interface to be configured, and enter interface configuration
mode.
Configure the boundary, specifying the access list you created in Step 2.
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
Chapter 45 Configuring IP Multicast Routing
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